Hydraulic rotary system start-stop buffering device, and crane

Abstract

The invention discloses a hydraulic rotary system start-stop buffering device, and a crane. The invention belongs to the technical field of a hydraulic system. The system comprises a closed type hydraulic pump and a rotary motor. An oil outlet of the closed type hydraulic pump is connected to an oil inlet of the rotary motor. An oil outlet of the rotary motor is connected to an oil inlet of the closed type hydraulic pump. The rotary motor is connected to a brake. A buffering device is connected in parallel with the rotary motor on a hydraulic oil path. The buffering device comprises an oil conduction part, an overflow part, and a damping conduction part. An oil outlet of the buffering device communicates with an oil tank. According to the invention, a bypass oil path with restricted flow rate is adopted, heavy load is increased or started or stopped damping is rapidly rotated, pressure gaining is retarded, the controllability is good, and the service life of a brake pad is prolonged.

Description

technical field [0001] The invention relates to hydraulic system technology, in particular to a start-stop buffer device and a crane for a hydraulic slewing system. Background technique [0002] At present, there are two types of crane hydraulic slewing systems, open and closed. Among them, the open system uses a reversing valve and a slewing buffer valve to realize the direction control of the slewing action and the start-stop buffer control, which can obtain better control performance. The pipeline is complicated and the cost is high; while the closed system is relatively simple. The closed pump itself can realize direction control, and the volume speed regulation method is also easy to realize, but the stability of start and stop needs to be improved. Figure 1a , Figure 1b and Figure 1c Three typical closed hydraulic rotary systems in the prior art are shown respectively, namely system 1, system 2, and system 3. The main difference between the three hydraulic rotary s...

AI Technical Summary

Problems solved by technology

[0005] 1) The opening and closing timing of the brake is set in advance by the program, which is difficult to match with the random load conditions. If the brake is closed too early, it will cause fatigue damage to the internal gear of the reducer, and if it is too late, it will cause a stop lag and increase the drifting feeling of the rotation. bad sex;

[0006] 2) For the method of adding buffer damping between the oil inlet and outlet of the motor, turning on the oil inlet and outlet of the motor will cause the phenomenon of slewing and starting reversal when the vehicle is on uneven roads;

[0007] 3) Wet dynamic brakes need to increase the flushing and cooling oil circuit, and adopt proportional control, and the brake pads are easy to wear and need to be replaced regularly, and the maintenance cost is high

Images